llvm-project/clang/test/SemaCXX/Inputs/warn-zero-nullptr.h

#define NULL (0)
#define SYSTEM_MACRO (0)
#define OTHER_SYSTEM_MACRO (NULL)
[Sema] -Wzero-as-null-pointer-constant: don't warn for system macros other than NULL. Summary: The warning was initially introduced in D32914 by @thakis, and the concerns were raised there, and later in rL302247 and PR33771. I do believe that it makes sense to relax the diagnostic e.g. in this case, when the expression originates from the system header, which can not be modified. This prevents adoption for the diagnostic for codebases which use pthreads (`PTHREAD_MUTEX_INITIALIZER`), gtest, etc. As @malcolm.parsons suggests, it may make sense to also not warn for the template types, but it is not obvious to me how to do that in here. Though, it still makes sense to complain about `NULL` macro. While there, add more tests. Reviewers: dblaikie, thakis, rsmith, rjmccall, aaron.ballman Reviewed By: thakis Subscribers: Rakete1111, hans, cfe-commits, thakis, malcolm.parsons Tags: #clang Differential Revision: https://reviews.llvm.org/D38954 llvm-svn: 316662 2017-10-26 21:18:14 +08:00			`#define NULL (0)`
			`#define SYSTEM_MACRO (0)`
			`#define OTHER_SYSTEM_MACRO (NULL)`